The chemical equation would be written as:
C7H6O3 + C4H6O3 –> C9H8O4 +C2H4O2
First, we need to determine the limiting reactant by converting them into moles. After, we use the amount of limiting of reactant to determine the theoretical yield.
89g of salicylic acid ( 1 mol / 138.13 g ) = 0.644 mol
21 ml of acetic anhydride ( 1.02 g / mL) ( 1 mol / 102.09 g ) = 0.2098 mol
Therefore, the limiting reactant would be the acetic anhydride as it is th consumed completely.
0.2098 mol acetic anhydride ( 1 mol C9H8O4 / 1 mol acetic anhydride) ( 180.157 g / 1 mol ) = 37.80 g C9H8O4
Percent yield = 11.3 / 37.80 x 100 = 29.89%
